BMW E46 M3 CSL/ZCP 345x28mm 2‑Piece Front Brake Upgrade Kit – Semi‑Floating Drilled & Grooved Rotors/Discs – OEM Caliper Compatible Big Brake Conversion – Direct‑Fit, Fits Most 18" Wheels – Track Day Ready | ECS Tuning

Transform the way your BMW E46 M3 stops with this CSL-size 345 x 28 mm two-piece rotor conversion. Serious stopping power, cooler running and repeatable performance for fast road and track day use, all while keeping your original calipers.

This bolt-on brake upgrade uses lightweight composite discs with an alloy hat and a heat-treated iron ring to deliver stronger bite, better heat dissipation and superb pedal feel. It is a simple service-style swap that accepts commonly available pad shapes, fits behind most 18 inch wheels and will also clear certain big brake friendly 17 inch track wheels.

Why choose this CSL-size conversion

• Significant increase in braking torque for quicker deceleration and shorter stopping distances
• Greater thermal capacity to fight fade during hard driving, B-road blasts and circuit work
• Works with your existing calipers, brake lines and hardware for an easy fit
• Uses readily available E36 M3 and E46 M3 pad shapes for low-cost maintenance
• Proven on our own cars and loved by customers for confidence-inspiring performance

Engineering that makes the difference

• Two-piece semi-floating construction for controlled radial expansion and reduced risk of warping
• Lightweight 6061 aluminium hats with hard black anodising for durability and corrosion resistance
• Heat-treated grey cast iron rings that manage extreme temperatures with stable friction characteristics
• Directional internal vanes to accelerate airflow and cool the discs rapidly
• Cross drilled and slotted faces to de-gas pads, sweep away dust and water, and maintain a clean contact surface
• Chamfered holes and precisely machined slots to minimise the chance of cracking
• Non-friction surfaces, including internal vents, are coated for protection against salt and grime
• Ground friction faces for effortless bedding and perfectly parallel running
• Lower unsprung mass, with each disc around 18 lb compared to approximately 19.1 lb for the OE ZCP/CSL item, aiding suspension response and acceleration

Fitment and compatibility

• Designed around the BMW M3 E46 platform
• CSL and Competition Package sizing, 345 mm diameter and 28 mm thickness
• Fits behind most 18 inch wheels and selected 17 inch big brake friendly wheels
• Keeps factory calipers, hoses and fixings for a true plug-and-play install

Ideal for

• Fast road builds seeking more bite and confidence
• Track day enthusiasts wanting consistent laps without fade
• Drivers who want CSL-size stopping performance without the cost of a full caliper swap

Installation

As straightforward as a standard pad and disc service. Reuse your existing calipers, pads, lines and hardware. If you want it fitted for you, we can help. Book professional installation with MJ Modifications in Warwickshire. Request a fitting quote via info@mjmodifications.co.uk.

Search-friendly terms

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Ready to unlock CSL-level braking on your E46 M3 Order today for a direct-fit, high performance brake package that looks the part and performs even better.